Escalation& Multiplayer problems?

I have the PS3 version of the game, and I have slight problems with these two modes. For starters, I get kicked out after a wave in Escalation, and sometimes I'll have trouble staying in a game in multiplayer.

Had the same problem and her is how you fix it. You need to change your nat type on your router and PS3. you need to have a static IP. got to youtube and type in PS3 Nat and their will be videos to show you how.